Three dimensional steerable system

Details Three dimensional steerable system Three dimensional steerable system

E - Fixed Constructions

21

B

E21B 7/04 (2006.01) E21B 7/06 (2006.01) E21B 44/00 (2006.01)

Patent

CA 2394950

A steering assembly (20) includes upper (26) and lower (28) tubular housings connected by a universal joint (30). An angle cam (80) is dis- posed on the end of the lower housing and projects into the housing. A plurality of wedge members (90) extend axially from the upper housing and into engage- ment with the angle cam. Drive trains (150) are connected to the wedge members to move the wedge members toward and away from the angle cam to change the angle and azimuth of the lower housing with respect to the upper housing by the universal joint. The lower housing is connected to a bearing pack (16) sup- porting a drill bit (12) so as to change the direction of the drill bit. The steering assembly is connected to composite tubing (520) having conductors (584, 586) in the wall and a processor (514) is at the surface. Data on the position of the bit is transmitted to the processor to change the bend angle and direction of the drilling of the bit.

Un ensemble de direction (20) comprend des logements tubulaires supérieur (26) et inférieur (28) reliés par un joint universel (30). Une came d'angle (80) est disposée à l'extrémité du logement inférieur et se projette dans ledit logement. Une pluralité d'éléments de coin (90) s'étendent axialement à partir du logement supérieur et rentrent en contact avec la came d'angle. Des trains de transmission (150) sont reliés aux éléments de coin pour déplacer ces derniers vers la came d'angle et les éloigner de celle-ci de manière à modifier l'angle et l'azimut du logement inférieur par rapport au logement supérieur par le joint universel. Le logement inférieur est relié à un bloc de support (16) portant un trépan (12) de manière à modifier la direction dudit trépan. L'ensemble de direction est relié à des tubes composite (520) pourvus de tubes-guides (584, 586) dans la paroi, et un processeur (514) se trouve à la surface. Des données sur l'emplacement du trépan sont transmises au processeur pour modifier l'angle de cintrage et la direction de la foration du trépan.

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